content + partial

content_partial.rb

# Controller( UsersController ):
def do_something
  @some_var = some_value
  @some_other_var = some_other_value
  # additional controller logic
  render :do_something # this is not required if the view has the same name (i.e., app/views/users/do_something.html.erb)
end

# in the view (app/views/users/do_something.html.erb)
<%= render partial: partial_name, locals: { local_var_name: @some_var } %>
<h1> Here we put all the other HTML that we want</h1>
<p> .... </p>
<%= render partial: partial_name, locals: { local_var_name: @some_other_var } %>